Gate-valve.



N0. 869,525. PATENTED OCT. 29, 1907.

, L SCHUTTE GATE VALVE. APPLICATION FILED r3343, 100a.

UNITED STATES PATENT OFFICE.

LOUIS SOHUITTE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO SOHUTTE ANDKOERTING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

GATE VALVE Specification of Letters Patent.

Patented Oct. 29, 1907.

Application filed February 23. 1906- Serial No. 302.353.

- have invented a certain new and useful Improvement in Gate-Valves, ofwhich the following is a true and exact description, reference being hadto the accompanying drawings, which form a part thereof.

My invention relates to gate valves and has for its object to provide avalve of this character of high eiiiciency and great simplicity ofconstruction and operation.

The nature of my improvements will be best understood as described inconnection with the drawings in which they are illustrated and in whichFigure 1 is a sectional longitudinal elevation through a valve casingand valve embodying my invention. Fig. 2'shows the same valve seated.Fig. 3 is a horizontal section on the line 33 of Fig. 2 and Fig. 4 is avertical section on the line 44 of Fig. 2.

A indicates the casing, which is formed with oppositely disposed valveseats A, A, and in the part lying between and above the valve seats withguide channels A A separated as shown by a vertical guide web A, saidchannels and guide web being formed in the space lying between and onboth sides of the valve seats and continued up into the space A,provided for the retraction of the valve. The casing is also'provided,as shown, with guides A A which form in 30, effect a continuation of thechannel guides A and are provided for the purpose of directing thevalves outward against their seats when they are forced down topositions opposite the seats.

B, is the cap of the valve extending over and somewhat prolonging thechamber A, as indicated at B,

a stuffing box B being provided for the valve stem and supporting arms Bextepding upward and supporting the annular hub B.

C, is the valve stem, the unthreaded portion of which 40 extends throughthe stuffing box 13*, while the threaded portion O, is engaged with thethreaded hub D,'rotatably supported in the annular bearing B and havingsecured to it the hand wheel D. The stem 0, has secured to its lower endthe valve supporting head E,

which as shown is provided with laterally and downwardly extending armsE, E, and also with a downwardly extending arm E these arms supportingthe bearing shaft E and the arms E, being continued down below thebearing shaft and laterally extended to form guides E, E, which engagethe ribs A, A

the head E, their outer ends being pivot-ally connected with the bearingpins H, H, of the oppositely disposed valves, said valves being formedwith inclined shoulders 11, H, which rest against the inclined shoulders E E, of the head E. The valves as shown are also formed withlaterally extending hubs H to which are secured the bearing rolls I, I,which work in the guideways A and when the valves are in proper position contact with the guides A In Fig. 1 the valves are shown in theposition in which they are lowered until they face their seats in thecasing, the guide rollers I being just in contact with the guideways A afurther downward movement of the stem C, and head E, forces the rollersI against the guideways A which lie practically perpendicular to thevalve seats and the valves therefore move outward against their seals,their supporting levers F, and G, acting as toggle levers as the head E,is ihmst downward. The upward movement of the head E and stem C,withdraws the valves from contact with their seats, permitting thelevers F and G to move downward to a suiiicient extent, and by means ofthe guideways A A and the guide rolls I to positively with draw thevalves and keep them in withdrawn position while they are moved up intothe chamber A The alinement of the valves is preserved in myconstruction by the'contacting faces or shoulders E H, E, H, theinclination of these parts being such as shown in Figs. 1 and 2, thatwhile the contacting shoulders do not interfere with the proper movementof the valve they practically do insure that it shall always preservesubstantial alinement with the valve faces. It will be observed,moreover, that the rolls I, carried. by each valve, and the pivotalconnections between the valve and its toggle arms are substantiallymidway between the top and bottom edges of the valve, so that they acton the center of the valve and therefore 'do not tend by their action tomove the valve out of substantial parallelism with itself.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is,

1. A gate valve casing having oppositely disposed seats in combinationwith a valve stem located between and extending transversely to saidseats and movable in the direction of its length, said casing havingguide surfaces at opposite sides of the seats extending substantiallyparallel to the valve passage, arms pivotaliy secured to said stem andextending on each side thereof, a valve pivotaliy' secured to the armsat each side of the stem, each valve having guide contacting surfacesnrrnngedlto engage said casing guide surfaces when the vaive stem ismoved in to the valve closing position and direct the valve toward itsseat \vithout tending to rotate it.

2. A gate valve casing having oppositely disposed seats and a set ofguide surfaces for holding the valves in retracted position while movingtoward and away from their operative positions, and a set of guidesurfaces for directing the valves towards said seats in combination withthe valve stem,'arms pivotally secured to said stem and ex tending oneach side thereof, and a valve pivotally secured to said arms on eachside of the stem, each valve having guide contacting surfaces arrangedto engage casing guide surfaces of each set and guide the valve in itsdetermined path. p

3. A gate valve casing having oppositely disposed seats in combinationwith a valve stem located between and ex tending transversely to saidseats and movable in the direction of its length, said casing havingguide surfaces at opposite sides of the seats extending transversely to.said stem, arms pivotally secured to said stem. and extending on. eachside thereof, a valve pivotally secured to the arms at each side of thestem, each valve having guide contacting surfaces concentric with thepivotal connection between the valve and arms, arranged to engagesaid-casing guide surfaces when the valve stem. is moved in to the valveclosing position and direct the valve toward its seat without tending torotate it. v

4. A. gate valve casing having oppositely disposed seats and guides fordirecting the valves, in combination with a valve stem, a head securedto said stern, having inclined shoulders E E arms F, G, pivoted on thehead, valves H, H, pivotally seeured to said arms on opposite sides ofthe head, said valves having inclined shoulders H H contacting with theshoulders E E, and guide rollers I, I, secured to the valves and actingin connection with the guides of the casing.

5. A gate valve casing having oppositely disposed seats and guides A AA, A, for directing the valves, in combination with a valve stem, a headsecured to said stem, having guide lugs E E and inclined shoulders E E,arms F, G, pivoted on the head, valves H, H, pivotally secured to saidarms on opposite sides of the head, said valves having inclinedshoulders H, 11*, contacting with the shoulders E E, and guide rollersI, I, secured to the valves and acting in connection with the guides ofthe casing 6. A gate valve casing having oppositely disposed seats incombination with a valve stem located between and ex tendingtransversely to said seats and movable in the direction of its length,said casing having a set of guide surfaces at opposite sides of theseats extending trans versely to said stem, and a set of guide surfacesalso at opposite sides of-said seats and extending parallel to the stem,arms pivotally secured to said stem and extending seems on each sidethereof, a valve pivotally secured to the arms at each side of thestein,'each valve having guide contacting surfaces arranged to engagesaid transversely extending casing guide surfaces when the valve stem ismoved into the valve closing position and direct the "dive toward itsseat without tending to rotate it, said guide contacting surfaces beingalso arranged to engage said parallel extending guide surfaces to holdthe valve retracted when away from its operative position.

7. A gate valve casing, having oppositely disposed seats and guides fordirecting the valves towards said seats, in combination with a valvestem, arms pivotally secured to said stem and extending on each sidethereof, valves, one for each seat each pivotally connected midwaybetween an opposite pair of its edges to said arms and guiding portionscarried by each valve in substantial alinemeut with the pivotalconnection between the valve and said arms for engaging said guides.

8. A gate valve casing having oppositely disposed seats, guidesextending parallel to the valve stem for holding the valves in retractedposition while moving toward and away from theinoperative positions andfor guiding the valve stem head and the guides for directing the valvestoward their seats, in combination with a valve stem, 21

head carried by the stem, arms pivotally secured to said head andextending on each side thereof, valves pivotally secured to said arms,one on each side of the stem, said valves and valve stem head havingguide contacting surfaces arranged to engage the guides in the casing.

9. A gate valve casing having oppositely'disposed seats in combinationwith a valve stem located between said valve seats and extendingtransversely to the valve passage and movable in the direction of itslength, said casing having at opposite sides of the valve seats a set ofguide surfaces extending parallel to the stem, and another set of guidesurfaces extending substantially parallel to the valve passage, a shaftcarried by and extending transversely to the valve stem, valves, one foreach seat, and an arm or arms connecting each valve to said shaft, eacharm having one end pivot-ally connected to the shaft and the other endpivotally connected to the corresponding valve, each valve having guidecontacting surfaces engaging casing guide surfaces of both sets.

LOUIS SCHUTTE.

Witnesses Annono Ka'rz, D. STEWART.

